第4回 スタートHaskell2 exercise8 エコー
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echo = do | |
str <- getLine | |
if str == "quit" | |
then do | |
putStrLn "Do you really want to quit? (yes/no)" | |
ans <- getLine | |
if ans == "yes" | |
then return () | |
else echo | |
else do | |
putStrLn str | |
echo | |
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